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Either your monitor or video card is going bad. Try a different monitor to isolate the problem. If you attach a different monitor and it does the same thing, then your video card is going bad. if you attach a different monitor and it does not have the problem, then your monitor is going bad.

Im assuming the monitor worked OK until now. The two things I can think of is, First is the cable from the monitor to the computer is either not connected tight either on the monitor side or the computer. The second thing I can think of is a bad video card. I think the monitor is ok because your getting the power save mode on the screen.

I hope this helps you out, if it does please leave me some positive feedback.

There are four things you can check for a blurred monitor:
1. The monitor itself (you eliminated that one)
2. The monitor cable and it's connection (make sure the cable is connected well on both ends, replace it if you can)
3. Video card driver (new drivers are free from the manufacturer's website
4. Video card (the card itself might be bad)

What do you mean by four sections. Can you see everything on the screen but just in different colors. If so then it is the video card. Another thing you may want to try is to reseat the LCD cable on the system.

Check the cable. Swap to a different cable if possible to rule that out.

Check the refresh rate of your monitor. Most monitors have options for this via a Menu button on the screen itself.If you find it, change it to 60 hertz

Check the refresh rate of the monitor from your operating system/video card's software.In Windows, right click on the desktop, click Properties, then the Settings tab, then Advanced. Change it to 60 hertz if it's anything different.

A number of things can cause this. Incorrect BIOS settings, cable problems, a faulty monitor or problems with your video card.

1) If you can change the monitor cable - do so
If it worked, great else - carry on....
2) If you have two monitor inputs on your computer swap the connection to another input, only if it is on another card. If it worked great, else carry on.....
3) Try a different monitor to see if the same thing occurrs... if it does then it is either video card or BIOS
4) Reboot your computer and watch the screen - it will tell you to pres a key to enter BIOS or setup - do so.
Switch of cacheing of Video RAM
and Disable ACPI settings - all power and green energy settings. If that does not do the trick then it is most likely your video card - or your monitor... borrow a monitor and video card for ten minutes and you will find out which is the problem

If you are using VGA, the horizontal line could be due to interference, like from an electric motor (fan) near the video cable.

Other thing to try is to change the refresh rate. In Windows XP: Control panel --> Display Properties --> Settings tab --> Advanced button --> Monitor tab --> Screen refresh rate. The default ot 60Hz for LCD monitors. Bump it up to 75Hz. That could give a clue to the problem or maybe even fix it.